MODELING OF PHOTOREFLECTANCE PHENOMENA IN LAYERED MEDIA

This paper presents a detailed three-dimensional analysis for the mode lling of the photoreflectance effect, in particular the response of la yered. samples is considered. The dependence of the photoreflectance s ignal on various parameters such as lifetime, surface recombination ve locity and carrier diffusion coefficient is discussed. It is shown tha t the carrier diffusion coefficient and the thermal diffusivity play a n important role in determining the signal level from the photoreflect ance system. The effects of the wavelength of the pump and probe beams are also discussed. Furthermore, a last numerical algorithm, allowing for a rapid computational evaluation, has been applied.